Threading dfvice



June 9, 1936. s. F. NEWMAN THREADING DEVICE Filed Oct. '15, 1934 2Sheets-Sheet 1 INVENTOR.

, ATTORNEY.

A June 9, 1936.

s. F. NEWMAN 2,043,862

THREADING DEVICE ,Filed OGc. 15, 1934 2 Sheets-Sheet 2 45% I llATTORNEY.

Patented June 9, 1936 UNITED STATES THREADIN G DFVICE Samuel F. Newman,Waynesboro, Pa., assignor to Landis Machine Company, Waynesboro, Pa., a

corporation of Pennsylvania Application October 15, 1934, Serial No.748,390

BCIaims.

This invention relates to threading devices forthreading pipes, pipecouplings or other tubular members, and more particularly to threadingdevices having either the workholder or the thread cutting devicefloating or self-centering or aligning. The invention relates tothreading devices in which a receding collapsing tap is provided foroperating upon the work gripped and held against the action of threadcutting forces by a floating, self-aligning chuck. The invention alsorelates to a floating die head for external thread ing and provided withretractable threading elements for the purpose of cutting taperedthreads.

With the devices of this character heretofore employed, efforts havebeen made to have the supporting and aligning of the Work with thecutter head or tap to be borne by the sharp thread cutting teeth of thecutter head. This has been to a degree unsuccessful. It is objectionableon account of the wear and injury to the thread cutting teeth.

It is an object of this invention therefore, where the threading deviceor workholder is floating, to provide threading devices having means forsupporting and aligning the work and the threading devices independentlyof the cutting teeth of the threading devices and thus relieving thecutters of everything except the threading operations.

In carrying out the present invention means are provided for supportingand aligning the work with the cutter head or tap prior to and duringthe thread cutting operation, said means comprising a projectingwork-engaging member or the like.

Further objects and advantages will be apparent from the followingdescription taken in connection with the accompanying drawings whereinFig. 1 is a side elevation of a floating chuck and receding collapsibletap in operative relation with a pipe coupling in a position to beinternally threaded;

Fig. 2, a face view of the chuck looking from the right in Fig. 1;

Fig. 3, an end view of the tap of Fig. 1 looking from the left;

Fig. 4, a section on the line 4-4 of Fig. 3, showing the supporting ringand relation of the supporting lugs on said ring to the thread cuttingchasers, with the lugs of the supporting ring bearing upon thecounter-bore of thecoupling and the end of the coupling engaging saidring to produce recession of the threading elements during threading ofpipe or coupling;

Fig.5, a similar sectional view with the align ing lugs engaging thebottom of the counter-bore of the coupling or work to produce recessionof the threading elements;

Fig. 6, a similar section, but with the work 5 having no counter-boreand the receding action of the threading elements produced by theengagement of the end of the coupling with the supporting ring;

Fig. '7, a side elevation of a floating die head for external threadingof pipes and tubes, the work' being internally engaged by an aligningmember;

Fig. 8, a view similar to'Fig. 7, except the work is externally engagedby an aligning member;

Fig. 9, an end elevation of the floating die head taken from the left ofFig. 7 or Fig. 8; and

Fig. 10, a view taken on the line l0l0 of Fig. 8.

Referring to the drawings and particularly to Figures 1 to 6, a floatingworkholder or chuck Ill is provided which may be of any of a number ofnumerous types of constructions. The chuck I0 constitutes no part of thepresent invention. The chuck as shown may have a vertically movablemember 32 movable on two sets of ball bearings 33 and carried by thisvertically movable member is a horizontally movable member 34 similarlymovable on sets of ball bearings 35. The mov able members 32 and 34 areyieldingly centered in the chuck by means of pairs of springs 36 and 31engaging their respective ends. A ring 46 secured to the chuck I 0 bymeans of screws 41 maintains the members assembled therein. Jaws l I andI2 are carried by the horizontally movable member 34 of chuck I 0 forclampingly supporting a pipe coupling l3 or other work to be operatedupon. This chuck is mounted to hold the work against the threadingreaction but is-designed to float and align the work it supports with atap indicated generally at l4. It will be noted;,that members 32 and 34have a limited play within the cylindrical portions 38 and 39respectively of the chuck so as to permit suiflcient movement of thework clamping jaws H and I2 with the work to center the work to align itwith the tap.

The tap l4, having body portion 23, is of the type wherein the threadingtools or cutters l5 are moved out of operative position or are receded'bymovement of an operating ring l6 having an operating connection I1with collapsing means in the interior of the tap l4. Movement of theoperating ring I6 relative to the body member of the tap is produced byengagement of the operating ring or associated element with the work.

to permit disposal of the cutting portions ii of the threading elementstherebetween and i as shown in Fig. 4 thesupporting lugs "are adapted toflt the. counter bore 22 of the work I3 and the work coming in contactwiththe ring I automatically causes recession of the chasers or cuttingelements li during the axial travel oi tap and chuck in relation to eachother. when the desired length of thread is cut, collapse or withdrawalof the cutting elements from thread cutting position is eflec shown inFigure 5 is a modified arrangement providing a clearance between thecounter bore and the lugs III, the beveled extremity 2| of the lugsserving to center and support the work. Recession of the cuttingelements is produced by the beveled end of the supports engaging thebeveled bottom of the counter-bore.

Referring to Fig. 6 the work It has no counterbore and the supportinglugs are of slightly smaller external diameter to engage the. smoothbore of the work. In this embodiment the end of the work engaging thering it produces recession of the cutters. I

In operation the work havin been fastened in position between the jawsof the floating chuck the collapsible cutters and chuck, either of whichmay be fixed and the other movable, are brought together and thesupporting lugs 20 first engage the work and produce the necessaryalignment and support before any cutting action is accomplished, thusrelieving the cutting elements from the aligning and supporting duringthread cutting and the consequent wear or injury.

The construction above described is intended to produce internalthreading but the invention is not so limited but is adaptable toexternal threading and Figs. 7. 8, 9, and 10 are directed to this phaseof the invention. Referring to these figures a floating die head 2! isprovided with a work-engaging element 26 having a beveled extremity 21for cooperatively internally engaging the flared or beveledextremity ofa pipe or other work 28. The floating action of this die head is similarto that of' the floating chuck it hereinbefore described.

Instead of the work-engaging element 2, shown inFig. '1, a slottedwork-engaging element 20 shown in Fig. 8 may be employed, the slotspermitting projection of the chasers therethrough for engaging the work,the work-engaging element II being adapted'to fitover or receive the endof the work as shown. These'work-engaging elements 26 and 29 areslidingly mounted in the floating elements of the die headand areyieldingly held in their outermost positions as shown by means ofsprings 40 and M respectively which permit them to move inwardly of thedie head when the work is in engagement therewith so thatthe work iswill enter the tap. .Key elements 42 and 43 engaging slots 44 and" inthe respective work engaging elements prevent them from rotating withrespect to the die heads.

The cutter head "is provided with cutting elements or chasers it whichare constructed to be moved by a lever ll. Any desired means may beprovided for retractingthe c tting elements.

With the constructions mm time. '1 to 10 work is secured in aworkholder', not'shown. and the floating die head moved toward the workor the work is moved toward the die head until the work engaging elementIt or 2! comes in contact .5 with the work and produces alignment andsupport of the parts so that the thread cutting operation can beperformed.

It will be obvious to" those skilled in the art thatvarious changes maybe made inlny device without departing from, the spirit of the inventionandtherefore, I do not limit myself to what I is shown in the drawingsand described lnthe specification. but only as set forth in the appendedclaims. 15 Iclaim:

1. A device workholding.

means andathreadingmemlnnoneofwhichis floating to' thereby providerelative movement and automatic alignment oi the members. one go or morethreading elements carried by the threading member. and means forsupporting the vwork relative to the threading member independently andout ofcontact with the threading elements.

2. A threading device comprising work-holdg5 ing means and a threadingelement in floating relation, and means independent of said threadingelement for supporting and aligning the same with respect to-the workduring the threading operation. v

8. In combination a floating chuck adapted to hold a workpiece, athreading device having cutting teeth adapted to cut a thread onsaidworkpiece and means independent of said teeth for maintaining the,workpiece and threading device as in alignment during the threadingoperation.

4. In combination asfloating chuck for the workpiece, a threading devicehaving cutting teeth, and a supporting. guide element for engaging thework and maintaining the centering thereto of as it is received andoperated upon by the cutting teeth for relieving the teeth of thethreading device from the aligning forces between the workpiece and thethreadingdevice during the threading operation.

5. A threading device comprising work-holding means andathreading memberone of which is floating, thereby providing relative movement andautomatic alignment therebetween. one or more threading elements carriedby the threading 60 member, said threading device comprising means forsupporting the work during the threading operation so that the sharpteeth of the cutting element do not support the work.

6. In combination, a floating chuck, a 5,5

ing member having sharp cutting teeth, and means for supp rting the workcarried by the chuck in a centered position with respect to thethreading member. independent of the cutting teeth during the threadcutting operation.

'l. In combination with means for threading and means for supportingwork to be threaded one of which is floating in order to alignitselfwith the other, and means independent of the cutting elements forsupporting and centering as theworkwithrespecttothethreadingmemberin aposition for the cutting element to perform the cutting operation. i

,8. In a threading device having floating means for providing automaticalignment, means for 70 supporting the work during the threadingoperation free of the cutting elements and forming-- ing and supportingthe end of the work in alignment with the threading element andmovablewiththeworkaxiallywithrespecttothethread- 7e ing element and during theengagement of the threading element with the work.

9. A threading device comprising work holding means and a threadingmember laterally movable with respect to each other for centering thework during work threading operations, one or more threading elementscarried by said threading member, and means mounted within the threadingmember independent 01' said threading elements for engaging andsupporting the end 01' the work in alignment with the threading elementand movable with the work axially with respect to the threading elementduring the engagement" of the threading element with the work.

SAMUEL F. NEWMAN.

